Protrusion Pattern Forming Device with Display Function

1. A protrusion pattern forming device with a display function, comprising: a transparent elastic sheet having an internal layer including colored liquid; and an actuator including a plurality of actuator elements disposed along one surface of the elastic sheet, each of the actuator elements changing its own shape in response to an application of a voltage, thereby causing a second surface of the elastic sheet to protrude, wherein a protrusion pattern is formed on the elastic sheet, wherein the colored liquid is moved away from each of the protrusions in the protrusion pattern, and wherein a dot pattern corresponding to the protrusion pattern is displayed on the elastic sheet by selectively driving the plurality of actuator elements.

2. The protrusion pattern forming device according to claim 1 , wherein the plurality of actuator elements each include an actuation member formed of an ion conductive polymer film, and changing its own shape to curve in response to the application of the voltage, and drive electrodes each formed on both surfaces of the actuation member.

3. The protrusion pattern forming device according to claim 2 , wherein the ion conductive polymer film is made of a cation exchange resin.

4. The protrusion pattern forming device according to claim 2 , wherein the drive electrode is made of carbon powder and an ion conductive resin.

5. The protrusion pattern forming device according to claim 2 , wherein the actuation member is configured as a tongue-like portion formed by cutting out a U shape from a sheet made of the ion conductive polymer film.

6. The protrusion pattern forming device according to claim 1 , wherein the plurality of actuator elements are each formed of a three-dimensional cross linked polymer.

7. The protrusion pattern forming device according to claim 1 , wherein the colored liquid is different in color from a protruded tip of each of the actuator elements.

8. The protrusion pattern forming device according to claim 7 , wherein the protruded tips of the plurality of actuator elements vary in color.

9. The protrusion pattern forming device according to claim 1 , wherein the protruded tip is spherical.

10. The protrusion pattern forming device according to claim 1 , wherein the elastic sheet has a partition wall to partition the internal layer into a plurality of areas.

11. The protrusion pattern forming device according to claim 1 , further comprising: a drive control section controlling the plurality of actuator elements for selective driving thereof, wherein the drive control section changes a protrusion density of the protrusion pattern and a dot density of the dot pattern by changing a number of the actuator elements for driving.

12. The protrusion pattern forming device according to claim 1 , wherein a protruded tip of each actuator that is selectively driven acts on the elastic sheet and moves the colored liquid away from the protruded tip of the actuator to create a corresponding dot and a corresponding protrusion.